A ‘bookmark’ is a special value that identifies a location in the AMPS transaction log. A bookmark subscription is similar to a regular subscription except that it contains a bookmark that AMPS will use to replay messages from the transaction log starting at the message just after the bookmark point in the transaction log. At the end of the replay, the subscription will become live similar to a regular subscription Each message delivered to an application that matches a bookmark subscription will contain a bookmark that can be recorded and used with subsequent bookmark subscribe requests so that the application does not miss any messages regardless of its up/down state.
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